Thermostatic circuit-closer.



PATENTED APR. 14, 1908,

, J. 0. woons. THBRMOSTATIG CIRCUIT CLOSER.

AP?LIOATI ON FILED MAY 10. 1907.

JAY [1W0 one; i

A TTOHNE YS' alums m l-:.. mam. IAsuulsvI. p. c.

v UNITED STATES P grnNT OFFICE,

;JAY Q .wooos, or RIVERSIDE, WASHINGTON, ASSIGNOR or our-n ts v ZGRAHAM.or RIVERSIDE, WASHINGTON.

TO JOSEPH W.

THERMOSTATIC oInoUIr-omsER.

Specification of Letters vI-"aten't.

Original application filed October 5, 1906, Serial No. 337,585. Dividedand this Patented April 14, 1908.

application filed May 10, 1907'. Serial new and useful Improvements inThermostatic Circuit-Closers, of which the following 1s a specification.

My invention relates to improvements in thermostatic circuit closers andis designed to 'be used in connection with incubators partic-:ularlywith the construction shown and de scribed iii a pendingapplicatloirSerial No.

337,585, filed by the present applicant, being a. division of saidpending application.

The object of the presentinvention is to produce a circuit closingdevice which will l gositively act to regulate the heat in an incu atorby actuating a damper,

\Vitli these objects in view my present in vention cmisists' nicertamnovel features oi construction, arrangement and, combination ofparts aswill be hereinafter fully described able conducting material which isbeveled to I the heat of the electric current as said ourand pointed outin the claims, reference being had to the accompanyingdrawing in whichFigure 1 is an elevation of my improved thermostat, Fig. 2 is asectional View of my incubator showing application of my thermostat,Fig. 3 is an enlarged sectional View of the thermostat.

In carrying out my invention I use my thermostat in connection with myimproved incubator illustrated in Fig.2 of the drawing. The thermostatconsists of a glass tube 14 having the bulbs 14 and 14 at its upper andlower ends respectively; within this tube the column of mercury 15 islaced, and resting on the mercury is the 1'0 16 consisting of a pin orrod of hard rubber or guttamrcha; the upper end or head of the hard ruber rod 16 is enlarged and provided with a tip 17 made of copper,aluminium or any other suit a pointand has the appearance of an arrowhead; this tip may bepa solid piece of'the material used, or the upperend of the rod" 16 may be beveled to a point and a piece of conductingmaterial bent over it and secured there. Extending into the u per bulbof the thermo-t at are the wires or e ectrodes- 18 and 19 which pass upthrough the egg chamber of the incubator and then out of same, one (18)passing to one pole of the battery 20' and the other (19) after passingthrough the elect-ru "the hot air duct 25.

magnet 21 passes .to and connects with the opposite pole of the battery.The electromagnet controls an armature 22"wlnch c0ntrols' the damper 23througn the. connecting the predetermined degree the mercury lifts thefloat mantel the beveled tip 17 comes in contact with the wires 18 and19 and forms a bridge between the, two, closing the circuit 1 throughthe electro-magnet and battery; the armature 22 being attracted by theelectromagnet moves inwardlyland causes the dam- .perto swing to avertical position shutting off heat from the lamp the heat then passingstraight up and into the'open air. Thus the heat is shut ofl. instantlyas soon as the temperature in the egg chamber'gets above thepredetermined point, a .l as sodu as the temperature of the egg chamberhas lowered suiiicient to cause the mercury to fall and allow the hardrubber to drop and draw the conductive tip away from the wires 1e and19, the circuit. will be broken and the dainper will beswung toitsinclinedposition permitting the heat of the lamp to again phss'to Byusing the hard rubber rod having: the

conductive tip, the heat of current. will not heat the mercury, as ifthe mercn'ry is heated, the circuit would be held" closed muchlongerthan isdesired and would then. allow thetemperature'of the eggchamber to fallt oo low.

W1th my improved construction the circuit is instantly closed when theheat goes beyond the predetermined degree, and is instantlyopened whenit again reaches said 'Jredetermined' degree, and furthermore no eatingof the mercury can-take place from rent passes through the copper tipand is comp etely insulated and isolated from the mercury column'by thehard rubber rod.

It will thus be seen that I produce a simple, cheap and eflicientthermostatic circuit I Gl0S61,Wl1lCl1 is extremely delicate, sensitiveand positive 1n its action.

i That I claim is:

1. A thermostatic circuit closer consisting 0i a thermometer tubehermetically sealed at its upper and lower ends and containing amercurial column, two wires forming the terminal contacts of an opencircuit and entering the thermometer above the mercury column, a rod ofinsulating material adapted to be lifted by said mercurial column theupper end of said float provided with eonductmg material, wherebyexpansion of the mercury above a predetermined degree will cause the rodto bridge the ends of the terminal wires of the open circuit and closethe circuit.

2. A thermostatic circuit closer comprising a tube hermetically sealedat its upper and lower ends and having a central bore terminating at itslower end in a mercury bulb and at its upper end in an enlarged chamberin which are arranged out of contact with each other the terminals of anopen electric circuit, a rod of insulating material adapted to be liftedby the column of mercury in the tube, said rod having at its upper endconducting material to bridge the space between the ends of the terminalwires and close the circuit.

A'thermostatic'circuit closer comprising a tube hermetically sealed atits upper and lower ends and having a central bore terminating at itslower end in a mercury bulb and having a space above the mercury column,a pair of terminal wires forming part of an open circuit and projectinginto the space above the mercury, a slidable rod uppiiir bulb, the endsof spaced apart, a slidable rod of insulating iaving a body portionadapted to of insulating material adapted to be lifted by said column ofmercury, upper end pointed and covered with a conducting material tobridge the space between the cnds of the terminal wires and close thecircuit.

4. A thermostatic circuit closer consisting of a tube hermeticallysealed at its upper and lowerends and having enlarged bulbs at saidupper and lower ends, and'a reduced central bore, a pair of terminalwires forming part of an open electric circuit and projecting into thesaid terminals being material fit loosely in the bore of said tube andan enlarged head projecting into the upper bulb, said head being ofgreater diameter than that of the central bore of the tube, said headportion having beveled sides covered with aagonducting material, wherebywhen the rorhfofl insulating material is lifted by the expansion of. thecolumn of mercury within the tube, the space between the ends of-theterminal wires will be bridged and the open circuit closed.

JAY o.woons.

Witnesses A. E. FREEMIRE,

J. W. GRAHAM.

said rod having its

